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Mathematics
Problem
Without using the general binomial formula, determine the coefficient of
x
2
x^{2}
x
2
in the expansion of
(
1
+
x
)
6
(1+x)^{6}
(
1
+
x
)
6
. a)
20
20
20
b)
10
10
10
c)
15
15
15
d)
30
30
30
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